Screw-threading implement.



G. F. CHAPMAN.

SCREW THREADING IMPLEMENT.

APPLIO'ATIOIN FILED NOV. 111111 8.

938,97 3. Patented Nov. 2, 1909.

2 SHEETS-SHEET 1.

2% AHA /U\ U I -/7 G. F. CHAPMAN. SCREW THREADING IMPLEMENT.

APPLICATION FILED NOV. 10, 1908.

Patented Nov. 2, 1909. 2 SHEETS-SHEET 2.

enonen r. CHAPMAN, ortnvron, INDIANA.

SCREW-THREADING IMPLEIVIENT.

Specification of Letters Patent.

Application filed November 10, 1908.

Patented Nov. 2, 1909.

Serial No. 461,936.

To all whom it may concern:

Be it known that I, GEORGE F. CHAPMAN, a citizen of the United States,residing at Linton, in the county of Greene and State of Indiana, haveinvented new and useful Improvements in Screw-Threading Implements, ofwhich the following is a specification.

My invention relates to improvements in screw-threading implements.

The primary object of the invention is the provision of a device of thischaracter wherein the stool: is constructed of sheet metal or cast iron,and wherein the stock is provided with a plurality of sets of dies ofvarious sizes.

A further object of the invention is the provision of a screw threadingimplement which is simple, durable and efficient, and which may bemanufactured and sold at a comparatively low cost.

With the above and other objects in View, the invention consists in theconstruction and arrangement of parts hereinafter fully described andclaimed, and illustrated in the accompanying drawing, wherein Figure 1is a top plan View of a screw threading implement constructed inaccordance with my invention. Fig. 2 is a view in side elevationthereof. Fig. 3 is a sectional view taken on a plane extending centrallyand longitudinally through the implement. Fig. 4 is a sectional viewtaken. on a plane extending transversely through the stock, and Fig. 5is a detail perspective view of one of the dies.

Referring to the drawings by reference numerals, 1 designates the stockand 2 the handles of my improved screw-threading implement. The stock 1is made of sheet metal, cast iron or malleable wrought iron andcomprises sides 3 and ends l. The lower portions of the sides 3 arefolded upon themselves as at 5 and thence extended inwardly at rightangles with relation to the sides to provide die plates 6. A pluralityof sets of dies 7 of different sizes are secured to the die plates 6 bymeans of bolts 8 and nuts 9. The nuts 9 are secured to the innersurfaces of the die plates 6 and the openings therein register withopenings formed in the die plates. The bolts 8 pass through openings 10formed in the dies 7, the openings in the dies being larger than thebolts to permit the dies to be adjusted on the bolts. Washers 11 aremounted between the heads of the bolts 8 and the dies 7 lVhen the bolts8 are turned in one direction the dies are clamped 12 to permit the useof a screwdriver in turning the bolts. Set-screws 13 are carried by nuts14 secured to the inner side of the portions 5 of the sides 3, saidset-screws assisting the bolts 8 to secure the die 7 in adjustedpositions. The dies 7 are provided with shoulders 15 which engage theinner edges of the die plates 6 and limit the movements of the dies inone direction. The dies of each set are adjustable with relation to eachother, that is to say, adjustable transversely of the stock.

To prevent the dies 7 from having any movements longitudinally of thestock, a member 16 is mounted between each set of dies, and members 17are mounted between the end walls 4 of the stock and the adja cent setsof dies, as best illustrated in Fig. 3 of the drawings. The members 16and 17 are secured to supports 18 which are in turn secured to the loweredges of the sides 3 of the stock. A guide 19 is secured to the up peredges of the ends 4:, and is provided at its longitudinal edges withdepending reinforcing fianges 20. The guide 19 is provided with aplurality of openings 21 of different sizes and a collar 22 is securedto the wall of each opening.

The ends 4 of the stock are higher than the sides 3 thereof, and theguide 19 has a transverse extent smaller than that of the stock, suchstructure providing an elongated opening on each side of the stock whichpermit the dies to be lubricated from the top of the stock.

The die plates 6 are strengthened by means of angular braces 23 whichare secured at their upper ends to the upper ends of the sides 3 andtheir lower ends to the inner end of the plate 6, as best illustrated inFig. 4

set-screws 13 which engage the particular dies. After the dies have beenproperly adjusted, the bolts 8 are turned to secure the dies inposition.

As the die stock is provided with a plurality of sets of dies ofdifferent sizes, it should be apparent that the device may be used forthreading pipes, rods, or the like, of a variety of sizes. It shouldalso be apparent that the invention is simple of construction, that itis durable and efficient, and that it may be manufactured and sold at acomparatively 'low cost.

Changes in the form, proportions and minor details of construction maybe made within the scope of the claim without departing from the spiritor sacrificing any of the advantages of the invention.

Having thus described the invention, what is claimed as new is A screwthreading implement includin a sheet metal stock which consists of sidewfl ls,

end walls extending above the side walls, die plates projecting inwardlyfrom and spaced above the lower edges of the side walls, supportssecured to the sides, a pluwith a plurality of openings, said guidebeing provided at its longitudinal edges with depending reinforcingflanges, collars secured to the under side of the guide and surroundingthe openings, and handles secured to the end walls.

In testimony whereof I aflix my signature in presence of two witnesses.

GEORGE F. CHAPMAN.

Witnesses EMANUEL DIXON, D. E. DIXON.

